Thank U so much for your time and inputs.

I will go through the amendment process now. on the other note, can i amend it after 3 years or not. I took it on 2009 and 2010. On 2011 i was already a resident and took the credit. i filed 1040A on both years and i was wondering if i go through amendment will i be in trouble for filing the 1040A instead of 1040NR/EZ. Furthermore, will they check my all the tax returns from 2009 till the day i file for citizenship or just of 5 years i.e starting 2011-2016.

Thanks again for your valuable time.